percentage = float(input("Porcentaje: %"))
of = float(input("De: "))

try:
    if percentage == 1:
        print(of * 0.01)

    elif percentage == 2:
        print(of * 0.02)

    elif percentage == 3:
        print(of * 0.03)

    elif percentage == 4:
        print(of * 0.04)

    elif percentage == 5:
        print(of * 0.05)

    elif percentage == 6:
        print(of * 0.06)

    elif percentage == 7:
        print(of * 0.07)

    elif percentage == 8:
        print(of * 0.08)

    elif percentage == 9:
        print(of * 0.09)

    elif percentage == 10:
        print(of * 0.1)

except:
    print("Error")